CN116136628A

CN116136628A - Liquid crystal display panel, manufacturing method thereof and display device

Info

Publication number: CN116136628A
Application number: CN202111370916.2A
Authority: CN
Inventors: 麦真富; 张宇; 肖岚清; 胡敏; 戴孟杰
Original assignee: Century Display Shenzhen Co Ltd
Current assignee: Century Display Shenzhen Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2023-05-19
Also published as: US11815758B2; US20230152623A1; TWI800116B; TW202321740A

Abstract

The application provides a liquid crystal display panel, a manufacturing method thereof and a display device, relates to the technical field of display, and aims to solve the problems of good front view display effect and poor squint display effect of a liquid crystal display. The liquid crystal display panel comprises a color filter substrate, a liquid crystal layer and a thin film transistor substrate, wherein the color filter substrate comprises a glass substrate and a black matrix and a color filter layer which are sequentially covered on the glass substrate, a plurality of grooves with different depths are formed in the surface of the glass substrate, the black matrix and the color filter layer are distributed in the grooves and correspond to the positions of the grooves with different depths, and the thickness of the liquid crystal layer and the depths of the grooves keep the same variation trend. When the sight is gradually changed from front view to oblique view, the depths of the grooves are gradually reduced, the thickness of the liquid crystal layer is gradually reduced, the display visual angle is gradually increased, and display effect difference caused by visual angle change is made up.

Description

Liquid crystal display panel, manufacturing method thereof and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a liquid crystal display panel, a manufacturing method thereof, and a display device.

Background

When a planar liquid crystal display is observed from different directions, the brightness, contrast and color of the display are different due to different angles of the sight line entering the liquid crystal. When the display screen is seen in front, the sight is perpendicular to the display screen, and the display effect is good; when the display screen is obliquely seen, the sight is out of the visual angle of the display screen, so that the picture contrast is low and the color is poor.

Compared with a plane screen, the curved screen accords with ergonomics better, and the distance between the sight of the user and the screen is equal. However, in the conventional manufacturing process of the curved panel of the lcd, the flat lcd panel is bent to match with the backlight plate with a certain curvature. However, the stress of the glass substrate of the bent liquid crystal display panel is uneven, the curvatures of the thin film transistor substrate and the color filter substrate are inconsistent, and the middle front view display effect of the liquid crystal display is good; the periphery is at the squint angle, and the contrast is low, and the colour is poor, seriously influences the display effect.

Disclosure of Invention

The application aims to provide a liquid crystal display panel, a manufacturing method thereof and a display device, which are used for solving the problems of display contrast reduction and color difference of a liquid crystal display caused by visual angles.

The first aspect of the application provides a liquid crystal display panel, including color filter base plate, liquid crystal layer and thin film transistor base plate, color filter base plate includes glass substrate and covers in proper order black matrix, color filter layer on the glass substrate, glass substrate's surface is provided with a plurality of recesses of different degree of depth, black matrix with color filter layer distributes a plurality of in the recess, and corresponds the position of recess of different degree of depth, the thickness of liquid crystal layer with a plurality of the degree of depth of recess keeps the same variation trend.

The second aspect of the present application further provides a display device, where the display device includes a liquid crystal display panel according to the above technical scheme, and further includes a backlight module, where the backlight module is located at a side of the liquid crystal display panel away from a display surface thereof.

The third aspect of the present application also provides a method for manufacturing a liquid crystal display panel, including: forming a color filter substrate, wherein forming the color filter substrate comprises forming a plurality of grooves with different depths on the surface of a glass substrate, and forming a black matrix and a color filter layer on the glass substrate, wherein the black matrix and the color filter layer are distributed in the grooves; the color filter substrate and a thin film transistor substrate are paired, and a liquid crystal layer is formed between the color filter substrate and the thin film transistor substrate; the thickness of the liquid crystal layer and the depth of the groove keep the same variation trend corresponding to the positions of the grooves with different depths.

Compared with the prior art, the surface of the glass substrate is provided with a plurality of grooves with different depths, the black matrix and the color filter layer are distributed in the grooves, the positions of the grooves with different depths correspond to each other, and the thickness of the liquid crystal layer and the depths of the grooves keep the same variation trend. When the depth of the plurality of grooves is larger, the thickness of the liquid crystal layer is larger, and the display visual angle is smaller; the smaller the depth of the plurality of grooves, the smaller the thickness of the liquid crystal layer, and the larger the display viewing angle. When the sight line is gradually changed from front view to oblique view/upward view, the thickness of the liquid crystal layer is gradually reduced, the display visual angle is gradually increased, and the problems of low contrast and poor color of the display effect at the edges and corners of the liquid crystal display panel caused by the visual angle are solved, so that the same display effect is achieved when the screen is observed from all angles.

Drawings

Fig. 1a is a cross-sectional view of a liquid crystal display panel according to an embodiment of the present application.

Fig. 1b is a cross-sectional view of a glass substrate according to an embodiment of the present disclosure.

Fig. 1c is a top view of a glass substrate according to an embodiment of the present disclosure.

Fig. 2a is a cross-sectional view of a liquid crystal display panel according to another embodiment of the present application.

Fig. 2b is a cross-sectional view of a glass substrate according to another embodiment of the present application.

Fig. 2c is a top view of a glass substrate according to another embodiment of the present disclosure.

Fig. 3 is a display device provided in an embodiment of the present application.

Fig. 4 is a flowchart of a method for manufacturing a liquid crystal display panel according to an embodiment of the present application.

Fig. 5 is a flowchart of a method for manufacturing a liquid crystal display panel according to another embodiment of the present application.

Description of the main reference signs

Liquid

crystal display panels

10A, 10B

Color filter substrate 100

Liquid crystal layer 200

Thin film transistor substrate 300

Frame glue 400

Display area 410

Non-display area 420

Glass substrate 110

Black matrix 120

Color filter layer 130

Protective layer 140

Groove 111

Width L

Red filter layer 131

Green filter layer 132

Blue filter layer 133

Edge region 411

Center region 412

First side 413

Second side 414

Display device 20

Backlight module 500

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. Wherein the thickness of each film layer and the shape of the region in the drawing do not reflect the actual proportion of the liquid crystal display panel, and the purpose is to illustrate the invention only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In order to further describe the technical means and effects adopted by the present application to achieve the predetermined purpose, the following detailed description is made in connection with the accompanying drawings and preferred embodiments.

Referring to fig. 1a, a liquid crystal display panel 10A provided in an embodiment of the present application includes: the liquid crystal display comprises a color filter substrate 100, a liquid crystal layer 200, a thin film transistor substrate 300 and a frame glue 400, wherein the thin film transistor substrate 300 is arranged opposite to the color filter substrate 100; the liquid crystal layer 200 is filled between the color filter substrate 100 and the thin film transistor substrate 300; the sealant 400 surrounds the liquid crystal layer 200 and connects the edges of the thin film transistor substrate 300 and the color filter substrate 100, so that the thin film transistor substrate 300 and the color filter substrate 100 maintain a certain gap. In addition, the sealant 400 can seal the liquid crystal, and prevent the entry of external pollutants while avoiding the leakage of the liquid crystal.

Referring to fig. 1a and 1c, the liquid crystal display panel 10A includes a display area 410 and a non-display area 420 surrounding the display area 410. The frame glue 400 is located in the non-display area 420.

The color filter substrate 100 includes a glass substrate 110, a black matrix 120 covered on the glass substrate 110, a color filter layer 130 covered on the glass substrate 110, and a protective layer 140 covered on the color filter layer 130 and the black matrix 120.

The color filter layer 130 includes a red filter layer 131, a green filter layer 132 and a blue filter layer 133 which are disposed on the glass substrate 110 at intervals, and the red filter layer 131, the green filter layer 132 and the blue filter layer 133 respectively filter out light with a specific range of wavelengths from a white light source, thereby displaying light with different colors.

The black matrix 120 is formed at the junction of any adjacent red filter layer 131, green filter layer 132 and blue filter layer 133 to absorb the critical light of the adjacent filter layers, reduce the interference of color mixture between pixels, and prevent the deterioration of color contrast. On the other hand, the black matrix 120 is also formed at a position of the glass substrate 110 corresponding to the non-display area 420, so as to achieve the effect of shielding light.

Referring to fig. 1b and 1c, the glass substrate 110 is provided with a plurality of grooves 111 with different depths on the surface of the display area 410. The depths of the plurality of grooves 111 become gradually greater in a direction in which the edge area 411 of the display area 410 is directed toward the center area 412 of the display area 410. The width L of each groove 111 is 0.8cm-1.2cm, and the depth difference between two adjacent grooves is 0.1 μm-1 μm.

The width L of the grooves 111 and the number of grooves 111 in fig. 1b, 1c do not reflect the actual scale of the liquid crystal display panel, and are for illustrative purposes only. The number of red filter layers 131, green filter layers 132 and blue filter layers 133 and the distribution of the red filter layers on the grooves 111 in fig. 1a do not reflect the actual situation of the color filter substrate 100, but are only for illustrative purposes. The shape of the boundary between adjacent ones of the grooves 111 in fig. 1c does not reflect the actual surface morphology of the glass substrate 110, and is for illustrative purposes only.

In some embodiments, in the above-mentioned liquid crystal display panel 10A provided in the present application, the width L of each groove 111 is 1cm, the depth difference between two adjacent grooves 111 is 0.1 μm, and the depths of the plurality of grooves 111 gradually increase along the direction in which the edge area 411 of the display area 410 points to the central area 412 of the display area 410.

In some embodiments, in the above-mentioned liquid crystal display panel 10A provided in the present application, the width L of each groove 111 is 1cm, the depth difference between two adjacent grooves 111 is 1 μm, and the depths of the plurality of grooves 111 gradually become larger along the direction in which the edge area 411 of the display area 410 points to the central area 412 of the display area 410.

The black matrix 120 and the color filter layer 130 are distributed in the plurality of grooves 111, and the protective layer 140 covers the color filter layer 130 and the black matrix 120. The thickness of the protective layer 140 is kept constant corresponding to the positions of the grooves 111 with different depths, so that the surface of the protective layer 140, which is close to the liquid crystal layer 200, is consistent with the surfaces of the grooves 111, and the thickness of the liquid crystal layer 200 is kept in the same variation trend as the depths of the grooves 111. I.e., the positions of the grooves 111 corresponding to the different depths of the surface of the glass substrate 110, the thickness of the liquid crystal layer 200 gradually increases in a direction in which the edge area 411 of the display area 410 is directed toward the center area 412 of the display area 410.

The liquid crystal display panel 10A is suitable for the case of being seen in a head-up state by an observer, when the line of sight of the observer falls from the central area 412 of the display area 410 to the edge area 411 of the display area 410, the thickness of the liquid crystal layer 200 becomes small, the display viewing angle of the liquid crystal display panel 10A becomes large, the display effect difference caused by the change of the viewing angle is compensated, and the problems of low contrast and poor color during strabismus are improved.

Referring to fig. 2a, another liquid crystal display panel 10B according to an embodiment of the present application includes: the liquid crystal display comprises a color filter substrate 100, a liquid crystal layer 200, a thin film transistor substrate 300 and a frame glue 400, wherein the thin film transistor substrate 300 is arranged opposite to the color filter substrate 100; the liquid crystal layer 200 is filled between the color filter substrate 100 and the thin film transistor substrate 300; the sealant 400 surrounds the liquid crystal layer 200 and connects the thin film transistor substrate 300 and the edge of the color filter substrate 100.

Referring to fig. 2a and 2c, the liquid crystal display panel 10B is divided into a display area 410 and a non-display area 420 surrounding the display area 410. The frame glue 400 is located in the non-display area 420.

Referring to fig. 2b and 2c, the glass substrate 110 is provided with a plurality of grooves 111 with different depths on the surface of the display area 410. The depth of the plurality of grooves 111 becomes progressively greater in a direction along the first side 413 of the display area 410 toward the second side 414 of the display area 410. The width L of each groove 111 is 0.8cm-1.2cm, and the depth difference between two adjacent grooves 111 is 0.1 μm-1 μm. In some embodiments, the first side 413 is a relatively upper side (e.g., a side near an upper edge of the liquid crystal display panel 10B) when the viewer views the display state of the liquid crystal display panel 10B, and the second side 414 is a relatively lower side (e.g., a side near a lower edge of the liquid crystal display panel 10B).

The width L and number of grooves 111 in fig. 2b, 2c do not reflect the actual scale of the liquid crystal display panel, and are for illustrative purposes only. The number of red filter layers 131, green filter layers 132 and blue filter layers 133 and the distribution of the red filter layers on the grooves 111 in fig. 2a do not reflect the actual situation of the color filter substrate 100, but are only for illustrative purposes. The shape of the boundary between adjacent ones of the grooves 111 in fig. 2c does not reflect the actual surface morphology of the glass substrate 110, and is for illustrative purposes only.

In some embodiments, in the above-mentioned liquid crystal display panel 10B provided in this application, the width L of each groove 111 is 1cm, the depth difference between two adjacent grooves 111 is 0.1 μm, and the depths of the plurality of grooves 111 gradually increase along the direction in which the first side 413 of the display area 410 points to the second side 414 of the display area 410.

In some embodiments, in the above-mentioned liquid crystal display panel 10B provided in this application, the width L of each groove 111 is 1cm, the depth difference between two adjacent grooves 111 is 1 μm, and the depths of the plurality of grooves 111 gradually increase along the direction in which the first side 413 of the display area 410 points to the second side 414 of the display area 410.

The black matrix 120 and the color filter layer 130 are distributed in the plurality of grooves 111, the protective layer 140 covers the color filter layer 130 and the black matrix 120, and the thickness of the protective layer 140 is kept constant corresponding to the positions of the grooves 111 with different depths, so that the surface of the protective layer 140, which is close to the liquid crystal layer 200, is kept consistent with the surfaces of the plurality of grooves 111, and the thickness of the liquid crystal layer 200 is kept the same trend as the depths of the plurality of grooves 111. I.e., the positions of the grooves 111 corresponding to the different depths of the surface of the glass substrate 110, the thickness of the liquid crystal layer 200 gradually increases in a direction in which the first side 413 of the display area 410 is directed to the second side 414 of the display area 410.

The liquid crystal display panel 10B is suitable for a case of being seen from the bottom of an observer. When the liquid crystal display panel 10B is in a hanging state, the first side 413 of the display area 410 is farther from the viewer than the second side 414 of the display area 410. When the line of sight of the observer falls from the second side 414 of the display area 410 to the first side 413 of the display area 410, the thickness of the liquid crystal layer 200 becomes smaller, and the display viewing angle of the liquid crystal display panel 10B becomes larger, so that the display effect difference caused by the change of the viewing angle is compensated, and the problems of low contrast and poor color during the upward viewing are improved.

Referring to fig. 3, the embodiment of the present application provides a display device 20, including the above-mentioned liquid crystal display panel, and further including a backlight module 500, where the backlight module 500 is located at a side of the liquid crystal display panel facing away from the display surface.

The advantages of the display device and the liquid crystal display panel are the same as those of the prior art, and are not described herein.

The embodiment of the application also provides a method for manufacturing a liquid crystal display panel, which is used for manufacturing the liquid crystal display panel according to the embodiment, and the method for manufacturing the liquid crystal display panel comprises the following steps: and forming a glass substrate, wherein a plurality of grooves with different depths are formed on the surface of the glass substrate, the positions of the grooves with different depths correspond to each other, and the thickness of the liquid crystal layer and the depths of the grooves keep the same variation trend.

Specifically, referring to fig. 4, the method for manufacturing the liquid crystal display panel is as follows.

Step S11, providing a glass with two opposite surfaces being plane, and cleaning the surface of the glass.

And S12, concavely folding the glass to form concave surfaces and convex surfaces on two opposite surfaces of the glass respectively.

In step S13, an etching solution is added to the concave surface of the glass.

And S14, utilizing different amounts or concentrations of etching liquid to damage different positions of the concave surface of the glass, so that the concave surface of the glass forms grooves with different depths, wherein the grooves formed at the positions with high or more concentrations of the etching liquid have deep depths, and the grooves formed at the positions with low or less concentrations of the etching liquid have shallow depths.

And S15, bending the glass concave to convex to be a plane, so as to form the glass substrate.

Step S16, cleaning the glass substrate.

In step S17, a black matrix is formed on the plurality of grooves of the glass substrate.

In step S18, color filter layers are formed on the plurality of grooves of the glass substrate. The color filter layer comprises a red filter layer, a green filter layer and a blue filter layer, and the filter layers are separated by a black matrix.

In step S19, a protective layer is formed on the black matrix and the color filter layer, and the thickness of the protective layer remains unchanged, so as to form the color filter substrate.

Step S20, forming a frame glue with an injection port at the opposite edges of the color filter substrate and the thin film transistor substrate so as to align and adhere the color filter substrate and the thin film transistor substrate.

And S21, injecting liquid crystal molecules between the color filter substrate and the thin film transistor substrate through an injection port of the frame glue to form a liquid crystal layer with the thickness changing along with the depth of the groove of the glass substrate.

And S22, sealing the injection port to form the liquid crystal display panel with the thickness of the liquid crystal layer changing along with the depth of the groove of the glass substrate.

An embodiment of the present application provides another method for manufacturing a liquid crystal display panel, which is used for manufacturing the liquid crystal display panel according to the above embodiment, and the method for manufacturing the liquid crystal display panel includes: and forming a glass substrate, wherein a plurality of grooves with different depths are formed on the surface of the glass substrate, the positions of the grooves with different depths correspond to each other, and the thickness of the liquid crystal layer and the depths of the grooves keep the same variation trend.

Specifically, referring to fig. 5, the method for manufacturing the liquid crystal display panel is as follows.

Step S101, providing a glass with two opposite surfaces being plane, and cleaning the surface of the glass.

Step S102, adding grinding fluid between the grinding machine table and the surface of the glass, wherein the grinding fluid is nano diamond grinding fluid.

And step S103, polishing different positions of the surface of the glass by using polishing machines with different curvatures, and forming grooves with different depths on the surface of the glass by using different pressures between the polishing machines and the surface of the glass to form a glass substrate.

Step S104, cleaning the glass substrate.

Step S105, forming a black matrix on the plurality of grooves of the glass substrate.

In step S106, color filter layers including red filter layer, green filter layer and blue filter layer are formed on the plurality of grooves of the glass substrate, and the filter layers are separated by a black matrix.

In step S107, a protective layer is formed on the black matrix and the color filter layer, and the thickness of the protective layer is kept unchanged, so that a color filter substrate is formed.

Step S108, forming a frame glue with an injection port at the opposite edges of the color filter substrate and the thin film transistor substrate so as to align and adhere the color filter substrate and the thin film transistor substrate.

In step S109, liquid crystal molecules are injected between the color filter substrate and the thin film transistor substrate through the injection port of the sealant, so as to form a liquid crystal layer with a thickness varying with the depth of the groove of the glass substrate.

Step S110, sealing the injection port to form the liquid crystal display panel with the thickness of the liquid crystal layer changing along with the depth of the groove of the glass substrate.

The nano diamond grinding fluid is formed by uniformly dispersing diamond micro powder in water, has dispersion stability, is suitable for ultra-precise polishing, can meet the requirements of optical glass and precious stone on machining precision, and can improve the quality of a machining surface while maintaining the grinding rate.

The above embodiments are only for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims

1. The utility model provides a liquid crystal display panel, includes color filter base plate, liquid crystal layer and thin film transistor base plate, color filter base plate includes glass substrate, covers black matrix on the glass substrate and covers color filter layer on the glass substrate, its characterized in that, glass substrate's surface is provided with a plurality of recesses of different degree of depth, black matrix with color filter layer distributes in a plurality of recesses, and correspond the position of recess of different degree of depth, the thickness of liquid crystal layer keeps the same variation trend with the degree of depth of a plurality of recess.

2. The liquid crystal display panel according to claim 1, wherein the depths of the plurality of grooves become gradually larger in a direction in which the edge region of the glass substrate is directed toward the central region of the glass substrate.

3. The liquid crystal display panel of claim 1, wherein the glass substrate has opposite first and second sides, and the depth of the plurality of grooves is gradually increased in a direction along the first side toward the second side.

4. A liquid crystal display panel according to claim 2 or 3, wherein each of the grooves has a width of 0.8cm to 1.2cm, and a depth difference between adjacent two of the grooves is 0.1 μm to 1 μm.

5. The liquid crystal display panel according to claim 1, wherein the thin film transistor substrate is disposed opposite to the color filter substrate; the liquid crystal layer is filled between the color filter substrate and the thin film transistor substrate.

6. A display device comprising the liquid crystal display panel according to any one of claims 1 to 5, and further comprising a backlight module, wherein the backlight module is located at a side of the liquid crystal display panel facing away from a display surface thereof.

7. A method for manufacturing a liquid crystal display panel, comprising:

forming a color filter substrate, wherein forming the color filter substrate comprises forming a plurality of grooves with different depths on the surface of a glass substrate, and forming a black matrix and a color filter layer on the glass substrate, wherein the black matrix and the color filter layer are distributed in the grooves; and

pairing the color filter substrate and a thin film transistor substrate, and forming a liquid crystal layer between the color filter substrate and the thin film transistor substrate;

the thickness of the liquid crystal layer and the depth of the grooves keep the same variation trend corresponding to the positions of the grooves with different depths.

8. The method according to claim 7, wherein a plurality of grooves having different depths are formed in the surface of the glass substrate by etching.

9. The method of manufacturing a liquid crystal display panel according to claim 8, wherein forming a plurality of grooves of different depths on the surface of the glass substrate by etching comprises:

concavely folding the glass to form a concave surface and a convex surface which are opposite to each other;

adding etching liquid into the concave surface of the glass, and etching the concave surface of the glass by using the etching liquid to form a plurality of grooves with different depths;

and folding the glass concavely to the convex surface to be a plane, so as to form the glass substrate.

10. The method according to claim 7, wherein a plurality of grooves having different depths are formed in the surface of the glass substrate by polishing.